Question

Which of these functions is one to one?
A. 2x^3-3x
B.squareroot of (x^2-3x-2)
C.6x+14
D.5x^2-x+3
E(.x^2+7)/(x-1)

Answer 1

the linear one
6x+14 there is no possibility that you can get two values of x for one value of y .

Answer 2

I don't understand what one to one means

Answer 3

it means for one value of x we should have exactly one value of y .

for example
y=x^2 is not one to one function since for x=-2 and x=+2 we get same value of y =4.